Change speed gear



Sept. 28, 1937. A A. LAUB 2,094,298

CHANGE SPEED GEAR Filed Aug. 5, 1936 7 Fig' 2 4 16 18a 5 INI IIIIYII UHIHIIIIHI 12 f 17 2a 1o 8 6 .1 2

A "1 1/1: 4 l, l 14 :LI

a 18a 7 12a j Patented sept. 2s, 1937 i f -f 2,094,298

CHANGE SPEED GEAR Adolf Laub, Basel, Switzerland, assgnor to HansScheidegger, Laufen, Switzerland ApplicationAugust 3, 1936, Serial No.94,093 In Switzerland August 7, 1935 Various change speed gears are`-already known tilt on the shaft I, which plate is provided in a 'inwhich the rotation of a driving shaft is transgroove in its peripherywith a sliding ring 4. mitted to a driven shaft by means of ak swashConnecting rods 6 are pivoted on pins 5 thereon.

, plate and a connecting mechanism working on Two relatively large gearwheels l, provided with k5" the driving shaft in dependence of the tiltof the rollerV ratchets not shown, are given driving im- 5 swash platewith respect to the shaft. All these pulses in opposite directions (seeFigure 2) when gears have however been found more or less unthe rotatingswash plate 3 is set tilted. The consatisfactory in use.r Apart from thefact that struction of the connecting mechanism so far many f them are0f complicated construction, described is in itself known and fullydescribed 10' they have the disadvantage that they only opin my Patent1,733,024 and it is therefore un- 10 crate in one direction, that is ltosay transmisnecessary to go into further detail. The tilting sion ofpower can only take place from the drivof the swash plate 3can be variedas desired ing to the driven shaft. This is a very great disfrom outsideby a suitable control mechanism.

advantage in the use of such gears on motor This mechanism comprises acontrol body 9 on a UNITED sTATEs PATENT oFFlca vehicles, because forexample in running, down v hollow screw spindle 8, which is moved alongl5Y hill the engine cannot be used to brake the ve-y when the spindle 8is turned by a Worm gear I0 hicle. connected to it. This results in twoinclined arms The present invention relates to a change II on the swashplate 3, which engage slidably in speed gear of the above stated type,which is suitable notchesl in the periphery of the control capable tosatisfy all the requirements of pracbody, being swung up or ldown andthe swash 20 tice. This change speed gear comprises an annuplate 3 beingset at a corresponding tilt to the lar motion transmitting or rotarymember loose shaft according to the direction of movement of upon thedriving shaft, which member can be 4the body 9. The wheels 1 are indriving connecbrought into coupling connection with the said tion with awormshaft I2'set transversely to the connecting mechanism, and furthermeans for driving shaft I. At its respective ends, shaftvIZ 25preventing movement of the rotary member when carries two toothed wheelsI2a, of which one is in in this coupling position and thereby also ofthe direct mesh with the corresponding wheel l, while internal teeth ofa planetary gear serving to the other is in indirect mesh with thecorrespondtransmit the rotation of the driving shaft to the ing wheel 1through an intermediate wheel |211.

driven shaft, in the opposite direction to the driv- By means of thetoothed wheel gearing just de- 30 ing movement imparted to the rotarymember scribed the successive driving impulses received when theconnecting mechanism is put into op- 'from the wheels 1 result in acontinuous rotation eration, in such a manner that with the driving ofthe worm shaft l2. The worm I2c on the shaft shaft rotating the rotationthereof is transmitted I2 meshes with a worm wheel I3 loose' upon the tothe driven shaft by means of a wheel fast driving shaft I, with whichWheel I3 another 35V upon the driving shaft and forming ythe sun toothedwheel I4 constructed at the same time as wheel of the said planetarygear and ofthe intera dog clutch, is rigid.v The driving shaft I alsonal teeth cooperating with the said sun wheel and carries in addition toa keyed on wheel I5 which is prevented from rotating in the aboveindicated also constructed at the same time as a dog clutch,

40 direction by the said means. a loose and slidably arranged annularmotion `40 An example embodying the invention is shown transmitting orrotary member I6, which has a in the accompanying drawing. part I62iconstructed as a dog clutch. The rotary Figure 1 is a vertical sectionof the change member I5 further has two internally toothed speed gear,parts of different breadths of which the broader Figure 2 is a plan Viewof Figure 1, certain is coupled to a toothed wheel I5 through planet 45parts being shown in section, and wheels I1. The planet wheels are looseupon pins Figures 3 and 4 are two vertical sections of Ilv of amultiarmed spider 2a fast on the driven the rear part of the gear in twodifferent coupling shaft 2. The shaft 2 is at the same timeconpositions. structed, as Figure 1 shows, as .a bearing for the In thefigures, I indicates the driving shaft of 'adjacent end of the drivingshaft I. A swingable 50 the Change Speed gear, which as Ycan be seen inoperating fork I8a the free end of whose limbs Figures 1 and 2 extendsthrough the whole gear, engage in a groove in the periphery of thememand 2 indicates the driven shaft whose particuber I6 serves to slidethelatter on the shaft I. lar construction is described below. On thedriv- `I9 indicates an intermediate toothed wheel sliding lshaftl is aswash plate 3 adjustable-in its able parallel with the shaft I, whichcanibe 55 teeth of member I6 and the wheel I4. The purpose of thisintermediate wheel I9 is explained below.

The mode of operationof the above described gear is as follows:-

Assuming that with the swash plate 3 set perpendicular, the drivingshaft I is being rotated by some motor not shown and that the rotarymember I6 has been moved outiof its mid or neutral position by beingslid to the left to the position shown in Figure 1, by means of theoperating fork |85. its rotation to the planet wheels II which, sincethe member I6 which in this position is in engagement with the dogclutch part of the wheel I4 and is therefore locked owing to theself-locking action of the worm gear I2C, I3, are caused to roll withinthe internal teeth with which they mesh, which results in the shaft 2being set in`Y rotation at a reduced speed corresponding to the ratio ofreduction for which the planet gear is designed. The swash plate l isnow gradually tilted more and more-with respect to the shaft I by meansof the control ,mechanism 8, I, whereby the rotary member I6 is given agradually increasing speed through the worm gear E2C, i3 driven intheabove described manner, the rolling motion ofthe planet Wheels il takingpart in this movement of the member IG. This results in the shaft 2being given a corresponding additional speed. When the speed of themember IS equals that of the driving shaft I, the member I is slid tothe right from the position shown in Figure 1 by means of the forkr E33and brought into the position of Figurev 3 inA which the dog clutch partIta, of member IS mesheswith. the dogs on the wheel I5. f

Direct drive-is thus established and the connecting mechanism which bytilting the swash plate 3 and with the coaction of the worm gear I2C, I3effected the gradual increase in the original starting speed of theshaft 2 can again be put out of action by restoring the swash plate 3 toits original position perpendicular to the shaft i by means of thecontrol mechanism 8, I il.

In practice it is advantageous, in: order to make the control of thegear as simple as possible, to interlock the control member which slidesthe rotary member I6 with the adjustment. of the swash plate 3 in such away that both. members, that is the swash plate and rotary member, aremoved in proper relationshipl for correct functioning of the gear.

The position of the parts for reverse drive is shown in Figure 4. Therotating member I6, as can be seen in that gure, is in` its mid ,orneutral position, that is in a position in which it is-not clutchedeither to the wheel I Il or the wheel` I5. With the driving shaft Irotating the member I6 is set in rotation in reverse direction at aspeed depending on that of the shaft I. The swash plate 3 is now tiltedso far that if the intermediate wheel is brought into meshes shown inFigure 4, the member I6 is given an additional speed of rotation in thatdirection in which it is already rotating, by the wheel I 4 which isrotating in the same direction as the wheel I5. This additional rotationimparted to the member i6 results in the planet wheels I'I beingcompelled to roll on the teeth of wheel I in the opposite direction tothe rotation of the latter, which results in the shaft 2` rotating inthe opposite direction to shaft I.

For the particular case of useof the described The wheel I5 nowtransmits meshed simultaneously with the narrow internal change speedgear in motor vehicles, the main advantages of the gear are as follows:

(l) When forward gear is engaged (Figure 1) the driven shaft is notstarted from zero speed upwards, but directly with a definite startingspeed depending on the ratio of the planetary gear. 'I'his is ofimportance in starting the vehicle.

2) The connecting mechanism is used primarily to increase the startingspeed of the driven shaft; it is not subjected to the heavy stresses ofstarting the vehicle which is advantageous as regards itsy dimensions.

(3) The braking effect of the engine can be fully used, for example inrunning down hill, and not only in direct gear, but by engaging thereverse gear (Figure 4) also with a setting of the connecting mechanismfor a reduced speed de pending on the amount of tilting of the swashplate.

What I claim is;-

1. A change speed gear comprising a driving shaft, a driven shaft, a sunwheel coaxial with saidv driven shaft and in driving connection withsaid driving shaft, an internally toothed annular member free to rotatecoaXially about said sun wheel, aU planet carrier arranged between thedriven shaft and the driving shaft, planetary wheels on said carriermeshing with said sun wheel and the internal teeth of said annularmember, a swash plate on said driving shaft, control; lable means foradjusting the tilt of said swash plate, a clutch member, meansl forensuring in combination with the planetary gearing the transmission of,drive motionin the forward direction, independence on the tilt of saidswash plate, from said swash plate to said clutch member, and means forpositively coupling said annular member to said clutch member.

2A change speed gear according to claim 1 also comprising controllablemeans for uncoupling said annular member from said clutch member and forpositively coupling it with said sun wheel.

3. Al change speed gear according to claim 1 also comprisingcontrollable means for uncoupling said annular member from said clutchmember, and other controllable means adapted to rotate said annularmember from and in the opposite'direction to said clutch member.

4. A change speed gear according to claim 1 also comprising controllablemeans for uncoupling said annular member from-said clutch member,controllable means for coupling said annular member positively r to saidsun wheel, and other controllable means adapted to rotate said annularmember from and in the opposite direction to said clutch member.

5. A Vchange speed' gear comprising a driving shaft, a driven shaft inalignment therewith, a sun wheel fast on said driving shaft,.a planetcarrier arranged between the driving shaft and the driven shaft, planetwheels on` said'carrier meshing with said sun wheel, dog clutch teeth onsaid sun' wheel, a` dog clutch member loose on said driving shaft,adjustable swash plate mechanism actuatingA said dog clutch member, amotion transmitting member loose on said driving shait, controllablemeans for positively clutching said `motiontransmittingmemberalternatively to said `sun wheel and to said dogclutch y member, and internal teeth 1n said motion transmitting mem.-

ber permanentlymeshing with said planet wheels.

ADOLF. LAUB.

